fix(ffi): reject extension failures with Error objects by proggeramlug · Pull Request #8784 · PerryTS/perry

proggeramlug · 2026-08-24T22:09:35Z

Summary

make JsPromise::reject_string and native-async message rejection produce real JavaScript Error objects on the main thread
add a deferred rejection builder so extensions can safely construct structured rejection values after worker-thread work
preserve MySQL server .errno and common mysql2-style symbolic .code values such as ER_DUP_ENTRY
add direct mysql2, sharp, and native-async regressions plus native-library documentation

Verification

cargo test -p perry-runtime promise::native_async::tests --lib
cargo test -p perry-ext-mysql2 -p perry-ext-sharp
cargo test -p perry-ext-mysql2
cargo check -p perry-ffi -p perry-stdlib -p perry-ext-mysql2 -p perry-ext-sharp
cargo test --no-run -p perry-ext-events
cargo test --no-run -p perry-ext-fetch
cargo test --no-run -p perry-ext-http
cargo test --no-run -p perry-ext-net
cargo fmt --all -- --check
git diff --check

No package or workspace version bump.

Closes #8750

Summary by CodeRabbit

New Features
- Native asynchronous failures now reject with JavaScript Error objects containing usable message and stack properties.
- MySQL errors preserve compatible code and errno metadata.
- Added support for creating structured rejection values on the runtime’s main thread.
Documentation
- Updated native library documentation to explain asynchronous rejection options and error behavior.
Tests
- Added coverage for MySQL error metadata and invalid-handle failures returning proper Error objects.

coderabbitai · 2026-08-24T22:10:06Z

📝 Walkthrough

Walkthrough

Native async rejection now creates JavaScript Error objects with message and stack. The new reject_with API builds structured values on the main thread. mysql2 errors preserve symbolic code and numeric errno metadata. Test shims and documentation cover the new behavior.

Changes

Native extension Error rejections

Layer / File(s)	Summary
Runtime Error settlement `crates/perry-ffi/src/async_runtime.rs`, `crates/perry-runtime/src/promise/native_async.rs`, `crates/perry-stdlib/src/perry_ffi_async.rs`	`reject_string` now creates a JavaScript `Error` on the main thread. `reject_with` builds structured rejection values through the deferred FFI bridge. Cancellation and wrong-thread rejection paths also use `Error` objects.
Extension test bridge `crates/perry-ext-events/src/test_async_shims.rs`, `crates/perry-ext-fetch/src/test_async_shims.rs`, `crates/perry-ext-http/src/test_async_shims.rs`, `crates/perry-ext-mysql2/src/test_async_shims.rs`, `crates/perry-ext-net/src/test_async_shims.rs`, `crates/perry-ext-sharp/...`	Test-only shims support deferred rejection callbacks. Sharp tests add standalone runtime wiring and verify invalid-handle failures produce an `Error` with a message and stack.
MySQL structured errors `crates/perry-ext-mysql2/src/lib.rs`	Connection, pool, and query failures use `MysqlPromiseError`. Server errors include mapped `code` and numeric `errno` fields through `system_error_value`; other failures use Error messages. Tests verify both metadata and invalid-handle errors.
Async rejection documentation `docs/src/native-libraries/*.md`, `changelog.d/8750-ext-error-objects.md`	Documentation describes `reject_string`, `reject`, and `reject_with`, including Error properties and main-thread allocation. The changelog records the extension error behavior.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🟠 High · up to 7e87a

Native async failures can construct an Error from a message that may be invalidated during garbage collection, potentially causing incorrect rejection behavior or a runtime crash; this must be fixed before merging.

Sequence Diagram(s)

sequenceDiagram
  participant Extension
  participant JsPromise
  participant AsyncBridge
  participant Runtime
  Extension->>JsPromise: reject_string(message)
  JsPromise->>AsyncBridge: queue deferred rejection
  AsyncBridge->>Runtime: invoke rejection callback on main thread
  Runtime->>Runtime: create Error with message and stack
  Runtime->>JsPromise: reject with Error object

✨ Finishing Touches

🧪 Generate unit tests (beta)

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Actionable comments posted: 1

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Inline comments:
In `@crates/perry-runtime/src/promise/native_async.rs`:
- Around line 194-201: Update error_value_bits to store the GC-managed message
in the active RuntimeHandleScope immediately after js_string_from_bytes returns
and before calling js_error_new_with_message, ensuring the root dominates that
allocation site.

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ℹ️ Review info

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Run ID: 4170bc19-e070-4c94-98c1-eccc690b0dd6

📥 Commits

Reviewing files that changed from the base of the PR and between 99e3abd and 7e87a1b.

⛔ Files ignored due to path filters (1)

Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (16)

changelog.d/8750-ext-error-objects.md
crates/perry-ext-events/src/test_async_shims.rs
crates/perry-ext-fetch/src/test_async_shims.rs
crates/perry-ext-http/src/test_async_shims.rs
crates/perry-ext-mysql2/src/lib.rs
crates/perry-ext-mysql2/src/test_async_shims.rs
crates/perry-ext-net/src/test_async_shims.rs
crates/perry-ext-sharp/Cargo.toml
crates/perry-ext-sharp/src/lib.rs
crates/perry-ext-sharp/src/test_async_shims.rs
crates/perry-ffi/src/async_runtime.rs
crates/perry-runtime/src/promise/native_async.rs
crates/perry-stdlib/src/perry_ffi_async.rs
docs/src/native-libraries/abi.md
docs/src/native-libraries/authoring-guide.md
docs/src/native-libraries/overview.md

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* fix(ffi): reject extension failures with Error objects * perf(codegen): version packed loops over closure captures * perf(codegen): specialize imported object literal methods * docs(changelog): note imported object method specialization * fix(codegen): address imported method review feedback * perf(codegen): specialize short packed spread calls * fix: address short packed spread review feedback * fix(hir): compose imported methods with static literals * fix(runtime): root native async error messages * chore: batch-landing fixes (fmt, payload baseline, module_decl 2000-line split) * fix(runtime): scope the native-async error message pointer (#7341) --------- Co-authored-by: Ralph Küpper <ralph@skelpo.com>

proggeramlug · 2026-08-25T07:25:52Z

Landed on main via the #8803 batch.

fix(ffi): reject extension failures with Error objects

7e87a1b

coderabbitai Bot reviewed Aug 24, 2026

View reviewed changes

Comment thread crates/perry-runtime/src/promise/native_async.rs

fix(runtime): root native async error messages

064a8d3

proggeramlug mentioned this pull request Aug 25, 2026

batch: land #8784, #8788, #8785, #8786 #8803

Merged

proggeramlug closed this Aug 25, 2026

proggeramlug deleted the fix/8750-ext-error-objects branch August 25, 2026 08:53

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fix(ffi): reject extension failures with Error objects - #8784

fix(ffi): reject extension failures with Error objects#8784
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